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Multilevel Structured Low-Density Parity-Check Codes

Record type: Conference or Workshop Item (Paper)

Low-Density Parity-Check (LDPC) codes are typically characterized by a relatively high-complexity description, since a considerable amount of memory is required in order to store their code description, which can be represented either by the connections of the edges in their Tanner graph or by the non-zero entries in their parity-check matrix (PCM). This problem becomes more pronounced for pseudo-random LDPC codes, where literally each non-zero entry of their PCM has to be enumerated, and stored in a look-up table. Therefore, they become inadequate for employment in memoryconstrained transceivers. Motivated by this, we are proposing a novel family of structured LDPC codes, termed as Multilevel Structured (MLS) LDPC codes, which benefit from reduced storage requirements, hardware-friendly implementations as well as from low-complexity encoding and decoding. Our simulation results demonstrate that these advantages accrue without any compromise in their attainable Bit Error Ratio (BER) performance, when compared to their previously proposed more complex counterparts of the same code-length. In particular, we characterize a half-rate quasi-cyclic (QC) MLS LDPC code having a block length of 8064 that can be uniquely and unambiguously described by as few as 144 edges, despite exhibiting an identical BER performance over both Additive White Gaussian Noise (AWGN) and uncorrelated Rayleigh (UR) channels, when compared to a pseudorandom construction, which requires the enumeration of a significantly higher number of 24,192 edges.

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Citation

Bonello, N., Chen, S. and Hanzo, L. (2008) Multilevel Structured Low-Density Parity-Check Codes At IEEE ICC'08, China. 19 - 23 May 2008. , pp. 729-733.

More information

Published date: May 2008
Additional Information: Event Dates: 19-23 May 2008
Venue - Dates: IEEE ICC'08, China, 2008-05-19 - 2008-05-23
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 264658
URI: http://eprints.soton.ac.uk/id/eprint/264658
PURE UUID: ce0ece47-85a9-4ef6-ad16-9ef36695d512

Catalogue record

Date deposited: 08 Oct 2007
Last modified: 18 Jul 2017 07:33

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Contributors

Author: N. Bonello
Author: S. Chen
Author: L. Hanzo

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